jackson also pushed a rule to reduce smog, but it faced bitter opposition from republicans and industry over the cost and potential effect on jobs, and last year, president obama ordered it withdrawn. still, environmental groups praised jackson for shepherding the first-ever national standards governing power plant emissions of mercury and other toxic pollutants. on her watch, the president also signed new fuel economy standards, doubling average gas mileage for new vehicles to more than 54 miles per gallon, by 2023. and jackson helped persuade the administration to delay the keystone oil pipeline, designed to bring oil from canada to refineries in texas. >> brown: we debate the obama administration's enviromental record under jackson's tenure with michael brune, executive director of the sierra club, one of the oldest environmental groups in the country. and kenneth green, senior fellow on energy and natural resources for the fraser institute, a canadian based think tank.